package util;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: HP
 * Date: 2023 -06 -25
 * Time: 19:53
 */
public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/order_system?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME="root";
    private static final String PASSWORD="9542zzzzz";

    private static volatile DataSource dataSource=null;

    public static DataSource getDataSource(){
        if(dataSource==null){
            synchronized (DBUtil.class){
                if(dataSource==null){
                    dataSource=new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setURL(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }
    public static Connection getConnection(){
        try {
            return getDataSource().getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        System.out.println("数据库链接失败~~");
        return null;
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        try{
            if(resultSet!=null){
                resultSet.close();
            }
            if(statement!=null){
                statement.close();
            }
            if(connection!=null){
                connection.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        System.out.println(DBUtil.getConnection());
    }
}
